Check if dtype has been initialized before

Author: droussea2001

pandas/core/construction.py

@@ -561,7 +561,11 @@ def sanitize_array(
         # Avoid ending up with a NumpyExtensionArray
         dtype = dtype.numpy_dtype
 
-    elif not pa_version_under10p1 and isinstance(data, (pa.ChunkedArray, pa.Array)):
+    elif (
+        not pa_version_under10p1
+        and isinstance(data, (pa.ChunkedArray, pa.Array))
+        and dtype is None
+    ):
         dtype = ArrowDtype(data.type)
 
     infer_object = not isinstance(data, (ABCIndex, ABCSeries))